Relations between beam group beam failure recovery and cell level beam failure recovery

Abstract

In operation, the UE in the cell (SpCell/SCell) may be configured to operate with beam group specific BFRs, cell-level BFRs, or combinations of them under a beam failure configuration that is determined according to various rules. A method of wireless communication performed by a user equipment (UE) and a UE is disclosed. The method includes determining a beam failure configuration for a serving cell, the beam failure configuration including at least one of a beam failure parameter of a beam group or a beam failure parameter of a cell; and detecting, in the serving cell based at least in part on the beam failure configuration, a beam failure recovery (BFR) based at least in part on the beam failure configuration. The beam failure configuration is determined based on various rules that control the operation of the BFR.

What is claimed is: 
     
       1. A method of wireless communication performed by a user equipment (UE), the method comprising:
 receiving, from a base station (BS), a communication indicating a beam failure configuration, the beam failure configuration including at least one of a beam failure parameter of a beam group or a beam failure parameter of a cell, wherein the at least one of the beam failure parameter of the beam group or the beam failure parameter of the cell is associated with a cell-level triggering condition or a beam group-specific triggering condition for initiating a beam failure recovery (BFR) procedure; and 
 detecting, in a serving cell based at least in part on the beam failure configuration, a beam failure. 
 
     
     
       2. The method of  claim 1 , wherein:
 the beam failure configuration includes the beam failure parameter of the beam group and does not include the beam failure parameter of the cell; and 
 the detecting the beam failure comprises detecting the beam failure based on the beam failure parameter of the beam group. 
 
     
     
       3. The method of  claim 2 , wherein the beam failure parameter of the beam group comprises at least one of a transmission-reception point (TRP)-specific beam failure detection (BFD) parameter or a TRP-specific BFR parameter. 
     
     
       4. The method of  claim 2 , wherein:
 the beam failure configuration includes a plurality of TRP-specific beam failure parameters associated with a plurality of TRPs; and 
 the detecting the beam failure comprises independently monitoring for beam for each of the plurality of TRPs. 
 
     
     
       5. The method of  claim 1 , wherein:
 the beam failure configuration includes the beam failure parameter of the cell and does not include the beam failure parameter of the beam group. 
 
     
     
       6. The method of  claim 5 , wherein the beam failure parameter of the cell comprises at least one of a cell-level BFD parameter or a cell-level BFR parameter. 
     
     
       7. The method of  claim 1 , wherein:
 the beam failure configuration includes the beam failure parameter of the beam group and the beam failure parameter of the cell; and 
 the beam failure parameter of the beam group includes a beam group-specific BFD parameter and the beam failure parameter of the cell includes a cell-level BFD parameter. 
 
     
     
       8. The method of  claim 7 , wherein the detecting the beam failure comprises:
 performing a first BFD based on the beam group-specific BFD parameter; and 
 performing a second BFD based on the cell-level BFD parameter. 
 
     
     
       9. The method of  claim 8 , wherein the beam failure configuration includes a beam group-specific BFR parameter and does not include a cell-level BFR parameter, the method further comprising:
 performing a BFR, in response to performing the first BFD, based on the beam group-specific BFR parameter. 
 
     
     
       10. The method of  claim 8 , wherein the beam failure configuration includes a cell-level BFR parameter and does not include a beam group-specific BFR parameter, the method further comprising:
 performing, in response to the performing the second BFD, a BFR based on the cell-level BFR parameter. 
 
     
     
       11. The method of  claim 8 , wherein:
 the performing the first BFD based on the beam group-specific beam failure detection parameter comprises monitoring for at least one TRP-specific BFD reference signal (RS); and 
 the performing the second BFD based on the cell-level BFD parameter comprises monitoring for at least one cell-level BFD RS. 
 
     
     
       12. The method of  claim 7 , wherein:
 the beam failure parameter of the beam group includes a TRP-specific BFD parameter and a TRP-specific BFR parameter; and 
 the detecting the beam failure comprises performing a BFD based on the TRP-specific BFD parameter, the method further comprising:
 performing, in response to the BFD indicating the beam failure, a BFR based on the TRP-specific BFR parameter. 
 
 
     
     
       13. The method of  claim 7 , wherein:
 the beam group-specific BFD parameter includes a TRP-specific BFD parameter; 
 the cell-level BFD parameter includes a cell-level BFR parameter; and 
 the detecting the beam failure comprises performing a BFD based on the TRP-specific BFD parameter, the method further comprising:
 performing, in response to the BFD indicating a beam failure, a BFR based on the cell-level BFR parameter. 
 
 
     
     
       14. The method of  claim 7 , wherein:
 the beam group-specific BFD parameter includes a TRP-specific BFD parameter and a TRP-specific BFR parameter; 
 the cell-level BFD parameter includes a cell-level BFD parameter and a cell-level BFR parameter; and 
 the detecting the beam failure comprises:
 performing a first BFD based on the TRP-specific BFD parameter; and 
 performing a second BFD based on the cell-level BFD parameter. 
 
 
     
     
       15. The method of  claim 14 , further comprising at least one of:
 performing, in response to the first BFD indicating the beam failure, a first BFR based on the TRP-specific BFR parameter; or 
 performing, in response to the second BFD indicating the beam failure, a second BFR based on the cell-level BFR parameter. 
 
     
     
       16. The method of  claim 1 , wherein:
 the beam failure configuration includes a plurality of TRP-specific beam failure parameters associated with a plurality of TRPs; and 
 the detecting the beam failure comprises:
 performing a BFD for each of the plurality of TRPs; and 
 performing, based on a number of BFDs indicating the beam failure, a BFR. 
 
 
     
     
       17. The method of  claim 16 , wherein the performing the BFR comprises:
 performing, in response to the number being less than a first threshold, a TRP-specific BFR; 
 performing, in response to the number being greater than a second threshold, a cell-level BFR; or 
 disallowing the cell-level BFR when a threshold number of working TRPs is exceeded. 
 
     
     
       18. The method of  claim 16 , further comprising:
 receiving, from the base station of the serving cell, an indication of at least one threshold value for determining whether to perform a TRP-specific BFR or a cell-level BFR. 
 
     
     
       19. The method of  claim 18 , wherein further comprises:
 performing, in response to detection of the beam failure, a cell-level BFR; and 
 terminating any active TRP-specific BFRs. 
 
     
     
       20. The method of  claim 7 , wherein:
 the beam group-specific BFD parameter includes a plurality of TRP-specific beam failure parameters associated with a plurality of TRPs; and 
 the detecting the beam failure comprises performing a BFD for each of the plurality of TRPs, the method further comprising: 
 performing, based on a number of BFDs indicating the beam failure, a recovery. 
 
     
     
       21. The method of  claim 20 , wherein:
 the cell-level BFD parameter includes a radio-link failure (RLF) parameter; and 
 the performing the recovery comprises:
 performing, in response to the number being less than a first threshold, a TRP-specific BFR; 
 performing, in response to the number being greater than a second threshold, an RLF recovery based on the RLF parameter; or 
 disallowing an RLF recovery when a threshold number of working TRPs is exceeded. 
 
 
     
     
       22. The method of  claim 20 , further comprising:
 receiving, from the base station, an indication of at least one threshold value for determining whether to perform a TRP-specific BFR or an RLF recovery. 
 
     
     
       23. The method of  claim 20 , wherein the performing the recovery includes:
 performing an RLF recovery; and 
 terminating any active TRP-specific BFR. 
 
     
     
       24. The method of  claim 7 , wherein detecting the beam failure comprises:
 performing a BFD based on the beam group-specific BFD parameter; and 
 performing a RLM based on the cell-level BFD parameter. 
 
     
     
       25. The method of  claim 24 , wherein:
 the performing the BFD based on the beam group-specific beam failure detection parameter comprises monitoring for at least one transmission-reception point (TRP)-specific BFD reference signal (RS); and 
 the performing the RLM based on the cell-level beam failure detection parameter comprises monitoring for at least one RLM RS. 
 
     
     
       26. The method of  claim 7 , further comprising:
 triggering a radio link failure (RLF) recovery; 
 performing, following the triggering of the RLF recovery, a plurality of transmission-reception point (TRP)-specific BFDs; and 
 adjusting, based on a consecutive number of the TRP-specific BFDs indicating the beam failure exceeding a threshold, a timer associated with the RLF recovery. 
 
     
     
       27. The method of  claim 26 , wherein:
 the adjusting the timer includes increasing or decreasing the timer by at least one of a predetermined amount of time or a percentage of a duration of the timer; or 
 the adjusting the timer includes adjusting the timer based on a number of TRPs associated with the TRP-specific BFDs indicating the beam failure. 
 
     
     
       28. A user equipment (UE), comprising:
 a memory; 
 a processor coupled to the memory; and 
 a transceiver coupled to the processor and configured to:
 receive, from a base station (BS), a communication indicating a beam failure configuration, the beam failure configuration including at least one of a beam failure parameter of a beam group or a beam failure parameter of a cell, wherein the at least one of the beam failure parameter of the beam group or the beam failure parameter of the cell is associated with a cell-level triggering condition or a beam group-specific triggering condition for initiating a beam failure recovery (BFR) procedure, wherein the processor is configured to: 
 detect, in a serving cell based at least in part on the beam failure configuration, a beam failure. 
 
 
     
     
       29. A non-transitory computer-readable medium having program code recorded thereon for operation on a user equipment (UE), the program code comprising:
 code for causing a UE to receive, from a base station (BS), a communication indicating a beam failure configuration, the beam failure configuration including at least one of a beam failure parameter of a beam group or a beam failure parameter of a cell, wherein the at least one of the beam failure parameter of the beam group or the beam failure parameter of the cell is associated with a cell-level triggering condition or a beam group-specific triggering condition for initiating a beam failure recovery (BFR) procedure; and 
 code for causing the UE to detect, in a serving cell based at least in part on the beam failure configuration, a beam failure. 
 
     
     
       30. A user equipment (UE), comprising:
 means for receiving, from a base station (BS), a communication indicating a beam failure configuration, the beam failure configuration including at least one of a beam failure parameter of a beam group or a beam failure parameter of a cell, wherein the at least one of the beam failure parameter of the beam group or the beam failure parameter of the cell is associated with a cell-level triggering condition or a beam group-specific triggering condition for initiating a beam failure recovery (BFR) procedure; and 
 means for detecting, in a serving cell based at least in part on the beam failure configuration, a beam failure.